Adorama offers the Seagate 4TB Central Network Attached Storage External Hard Drive, model no. STCG4000100, for $124. This $40 mail-in rebate cuts it to $84. With free shipping, that's $5 under our mention from three weeks ago and the lowest total price we've seen. (It's also a current price low by $44.) This PC/Mac-compatible NAS connects to your wired or wireless router for backup or file sharing. Rebate expires July 31.